Publication: Single amino acid changes outside the active site significantly affect activity of glutathione S-transferases
Issued Date
2001-01-01
Resource Type
ISSN
09651748
Other identifier(s)
2-s2.0-0035185961
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Mahidol University
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SCOPUS
Bibliographic Citation
Insect Biochemistry and Molecular Biology. Vol.31, No.1 (2001), 65-74
Suggested Citation
Albert J. Ketterman, Peerada Prommeenate, Chanikarn Boonchauy, Umnaj Chanama, Somphop Leetachewa, Nongkran Promtet, La aied Prapanthadara Single amino acid changes outside the active site significantly affect activity of glutathione S-transferases. Insect Biochemistry and Molecular Biology. Vol.31, No.1 (2001), 65-74. doi:10.1016/S0965-1748(00)00106-5 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/26415
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Title
Single amino acid changes outside the active site significantly affect activity of glutathione S-transferases
Abstract
Glutathione S-transferases (GSTs: E.C. 2.5.1.18) are a multigene family of multifunctional dimeric proteins that play a central role in detoxication. Four allelic forms of the mosquito Anopheles dirus GST, adGSTI-1, were cloned, expressed and characterized. The one or two amino acid changes in each allelic form was shown to confer different kinetic properties. Based on an available crystal structure, several of the residue changes were not in the putative substrate-binding pocket. Modeling showed that these insect Delta class GSTs also possess a hydrophobic surface pocket reported for Alpha, Mu and Pi class GSTs. The atom movement after replacement and minimization showed an average atom movement of about 0.1 Å for the 0 to 25 Å distance from the alpha carbon of the single replaced residue. This does not appear to be a significant movement in a static modeled protein structure. However, 200-500 atoms were involved with movements greater than 0.2 Å. Dynamics simulations were performed to study the effects this phenomenon would exert on the accessible conformations. The data show that residues affecting nearby responsive regions of tertiary structure can modulate enzyme specificities, possibly through regulating attainable configurations of the protein. © 2001 Elsevier Science Ltd.